• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 707
  • Last Modified:

all users are getting outbound email NDRs of "554 5.7.1 unable to relay"

We've just relocated and have new IPs for our WAN interface on the firewall.
Nothing has change on our internal scheme of

we are getting the NDR:
You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <mail.ourdomain.net #5.7.1 smtp;554 5.7.1 <outsideemailaddress@gmail.com>: Relay access denied>

I've checked all the relay settings and authentication and certificates...please not that none of this changed with our move either.

Thanks for the help!
1 Solution
Have you changed ISPs?
Check that you do not have a smart on the SMTP virtual server or on any SMTP connectors.


If your question has been answered, please remember to accept the answer and close the question.
New IP's for the WAN interface ==> new DNS entries required. Perhaps there has been a slip somewhere and the RDNS isn't working properly.

Is incoming mail arriving OK?
initialitAuthor Commented:
Thanks for the smart host idea...turns out our external spam filter is not properly updating and not letting us relay through them.

Side note, we did have to update RDNS, but had already done that

Thanks for the help!

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now